EP3072616B1 - Insert de coupe et outil de fraisage - Google Patents

Insert de coupe et outil de fraisage Download PDF

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Publication number
EP3072616B1
EP3072616B1 EP15160853.6A EP15160853A EP3072616B1 EP 3072616 B1 EP3072616 B1 EP 3072616B1 EP 15160853 A EP15160853 A EP 15160853A EP 3072616 B1 EP3072616 B1 EP 3072616B1
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EP
European Patent Office
Prior art keywords
insert
face
relief
cutting
cutting insert
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15160853.6A
Other languages
German (de)
English (en)
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EP3072616A1 (fr
Inventor
Amil Oprasic
Leif Widin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sandvik Intellectual Property AB
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Sandvik Intellectual Property AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sandvik Intellectual Property AB filed Critical Sandvik Intellectual Property AB
Priority to EP15160853.6A priority Critical patent/EP3072616B1/fr
Priority to JP2017549660A priority patent/JP6675416B2/ja
Priority to CN201680017289.5A priority patent/CN107405699B/zh
Priority to US15/561,044 priority patent/US10350686B2/en
Priority to PCT/EP2016/054550 priority patent/WO2016150672A1/fr
Publication of EP3072616A1 publication Critical patent/EP3072616A1/fr
Application granted granted Critical
Publication of EP3072616B1 publication Critical patent/EP3072616B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/06—Face-milling cutters, i.e. having only or primarily a substantially flat cutting surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/16—Milling-cutters characterised by physical features other than shape
    • B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/16—Milling-cutters characterised by physical features other than shape
    • B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
    • B23C5/202—Plate-like cutting inserts with special form
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/04—Overall shape
    • B23C2200/0494—Rectangular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/08—Rake or top surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/12—Side or flank surfaces
    • B23C2200/125—Side or flank surfaces discontinuous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/28—Angles
    • B23C2200/284—Negative clearance angles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft
    • B23C5/109—Shank-type cutters, i.e. with an integral shaft with removable cutting inserts

Definitions

  • the present invention relates to a cutting insert for a milling tool, and to a milling tool comprising such a cutting insert.
  • a milling tool is a rotating cutting tool, which may be provided with one or more cutting inserts.
  • a face milling tool is a particular kind of milling tool configured for "facing", i.e. milling plane surfaces.
  • US 2013/0045061 discloses a cutting insert for a rotating cutting tool according to the preamble of claim 1.
  • the cutting insert includes an upper surface, a lower surface, and a side surface which is connected to each of the upper surface and the lower surface.
  • the cutting insert is four times indexable in the cutting tool.
  • a cutting edge extends at an intersection of the upper surface and the side surface, and includes a first cutting edge, a corner cutting edge, and a second cutting edge.
  • the cutting insert is shaped to be used with a negative axial rake angle in the rotating cutting tool. Due to its shape, the cutting insert of US 2013/0045061 is cumbersome to manufacture. For instance the constraining parts have to be produced by a separate grinding step, subsequently to pressing and sintering of the cutting insert.
  • the object is achieved by a cutting insert for a milling tool, the cutting insert comprising an insert body having a central longitudinal axis extending along a longitudinal direction of the insert body and an imaginary centre plane comprising the central longitudinal axis.
  • the insert body is generally defined by a top surface, a bottom surface, and a circumferential surface extending between the top surface and the bottom surface, the top and bottom surfaces extending substantially in the longitudinal direction on opposite sides of the centre plane.
  • the insert body at the top surface comprises a first rake face and the bottom surface comprises a second rake face.
  • the insert body at the circumferential surface comprises a first radial side and a second radial side extending in the longitudinal direction on opposite sides of the insert body, and a first axial side and a second axial side extending across the longitudinal direction on opposite sides of the insert body.
  • the first axial side comprises a first relief face, a second relief face, and a first recess, the first relief face extending along the first rake face and the second relief face extending along the second rake face.
  • the first recess extends between the first and second relief faces and comprises a first bottom surface.
  • the insert body further comprises at least a first cutting edge, the first cutting edge extending along a rim portion at an intersection between the first rake face and both the first radial side and the first axial side.
  • the first relief face, the second relief face, and the first recess are arranged such that each point of the first relief face, the second relief face, and the first recess is visible from either a first side view towards the first radial side or from a second side view towards the second radial side, and such that the insert body is longer along the longitudinal direction at a central portion towards the central longitudinal axis than at an outer portion towards one of the first or second radial sides.
  • the cutting insert is formable by multiaxial pressing (MAP) with a partition of a relevant pressing tool at the central longitudinal axis, the first and second relief faces and the first recess being formable in the MAP operation.
  • MAP multiaxial pressing
  • the first and second side views are seen along the centre plane, perpendicularly to the longitudinal axis.
  • the cutting insert may be configured to be attached to a tool body of a milling tool.
  • the cutting insert may be configured for "facing", i.e. milling plane surfaces.
  • the cutting insert may be adapted to be held in a recess forming an insert seat of the milling tool.
  • the cutting insert may be indexable, i.e. the cutting insert may be positioned in different positions in the insert seat of the milling tool.
  • the first cutting edge may extend from the insert seat to engage with a workpiece in a mill.
  • the cutting insert may be manufactured from a material comprising e.g. one or more of cemented carbide, ceramics, cubic boron nitride, polycrystalline diamond, and/or cermet.
  • the cutting insert may be coated with surface coatings such as e.g. titanium nitride, titanium carbonitride, and/or aluminium oxide.
  • each of the first relief face, the second relief face, and the first bottom surface may comprise two major surfaces.
  • a major surface may form at least one fifth of the relevant first relief face, second relief face, or first bottom surface.
  • a major surface forms a continuous surface without any major or abrupt directional changes along the surface. At a major directional change or at an abrupt directional change, the major surface ends.
  • an angle between each of the two major surfaces of the first relief face, the second relief face, and the first bottom surface may be obtuse, such that the insert body is longer along the longitudinal direction at a central portion of one of said major surfaces towards the central longitudinal axis than at an outer portion of said one of said major surfaces towards one of the first or second radial sides.
  • the obtuse angle between each of the two major surfaces of the first relief face, the second relief face, and the first bottom surface may give the cutting insert a slightly pointed shape at the first axial side.
  • the two major surfaces of each of the first relief face, the second relief face, and the first bottom surface may be flat surfaces. According to alternative embodiments, at least one of the major surfaces of each of the first and second relief faces may be convex. According to embodiments, the first bottom surfaces may be perpendicular to the centre plane.
  • the first relief face may form an obtuse angle with the centre plane, such that the insert body is longer in the longitudinal direction at the first cutting edge than adjacent to the first recess.
  • a relief may be provided at the first cutting edge with the centre plane of the cutting insert arranged at a neutral, or only slightly negative, axial angle in in a relevant milling tool.
  • an acute wedge angle may be provided at the first cutting edge at the first axial side.
  • a positive axial rake angle may be provided at the first axial side with the centre plane of the cutting insert extending at a neutral or only slightly negative axial angle in a relevant milling tool. This entails that the cutting insert may be securely positioned in an insert seat of the milling tool.
  • the first cutting edge may comprise a first edge portion and a second edge portion extending along the first relief face, a third edge portion extending along the first radial side, and a corner edge portion, wherein the first edge portion may adjoin to the second edge portion, the second edge portion may adjoin to the corner edge portion, and the corner edge portion may adjoin to the third edge portion.
  • the first edge portion may extend at an angle to the second edge portion from the second edge portion towards the centre plane.
  • the cutting insert may be ramped into a workpiece, i.e. a relevant milling tool may be fed into the workpiece in the axial direction of the milling tool, commonly the Z direction of a relevant milling machine.
  • the second edge portion may in such case lead the cut into the workpiece in the Z direction, while the first cutting edge due to its angle and direction does not interfere with the cut in the Z direction.
  • the first edge portion may form an edge portion of a depression formed in the first rake face.
  • the second axial side may comprise a third relief face, a fourth relief face, and a second recess, the third relief face extending along the first rake face and the fourth relief face extending along the second rake face.
  • the second recess may extend between the third and fourth relief faces and may comprise a second bottom surface.
  • the third relief face, the fourth relief face, and the second recess may be arranged such that each point of the third relief face, the fourth relief face, and the second recess is visible from either the first side view towards the first radial side or from the second side view towards the second radial side, and such that the insert body is longer along the longitudinal direction at a central portion towards the central longitudinal axis than at an outer portion towards one of the first or second radial sides. Accordingly, the insert body may be longer along the longitudinal direction at a central portion towards the central longitudinal axis than at an outer portion towards one of the first or second radial sides.
  • the cutting insert may be configured to be formable by multiaxial pressing (MAP) with a partition of a relevant pressing tool at the central longitudinal axis, the third and fourth relief faces and the second recess being formable in the MAP operation.
  • MAP multiaxial pressing
  • each of the third relief face, the fourth relief face, and the second bottom surface may comprise two major surfaces.
  • an angle between each of the two major surfaces of the third relief face, the fourth relief face, and the second bottom surface may be obtuse. Again, the obtuse angle may give the cutting insert a slightly pointed shape, in this case at the second axial side.
  • the insert body may be longest along the longitudinal direction at a central portion adjacent to the central longitudinal axis and gradually decreasing in length towards the first and second radial sides, such that a partition line of a multiaxial pressing tool for forming the cutting insert is positionable at the central portion.
  • the insert body may comprise a second cutting edge extending along a rim portion at an intersection between the first rake face and both the second radial side and the second axial side, a third cutting edge extending along a rim portion at an intersection between the second rake face and both the first radial side and the second axial side, and a fourth cutting edge extending along a rim portion at an intersection between the second rake face and both the second radial side and the first axial side, such that the cutting insert is four times indexable in a milling tool.
  • the cutting insert may be rotationally symmetrical around the central longitudinal axis and around a central transverse axis that is perpendicular the longitudinal axis.
  • a milling tool configured to be rotated about a rotation axis comprising a tool body, wherein the tool body at an axial end portion thereof is provided with an insert seat for receiving a cutting insert.
  • the milling tool comprises a cutting insert according to any aspect and/or embodiment discussed herein arranged in the insert seat.
  • the milling tool may be provided with more than one cutting insert according to aspects and/or embodiments discussed herein.
  • the milling tool may be a face milling tool, i.e. a milling tool for milling plane surfaces.
  • the insert seat may be provided with a tangential support surface, a radial support surface, and an axial support surface.
  • the cutting insert may be arranged with a portion of the second rake face abutting against the tangential support surface, a portion of the second radial side abutting against the radial support surface, and a portion of the second bottom surface of the second recess abutting against the axial support surface. In this manner the cutting insert may be securely supported in the insert seat with the first cutting edge extending beyond the insert seat for cutting engagement with a workpiece.
  • the portion of the second bottom surface abutting against the axial support surface may be that major surface of the second bottom surface which is closest to the first radial side. Since this major surface is angled towards the central longitudinal axis, the cutting insert is direct in the radial direction by the axial cutting force, to which the cutting insert is subjected. In this manner the cutting insert may be biased towards the radial support surface and thus, locked securely in the insert seat.
  • the tangential support surface may extend from a first end portion at an axial end of the tool body to a second end portion at the axial support surface of the insert seat, and wherein seen in a rotational direction of the milling tool the second end portion may extend ahead of the first end portion.
  • the cutting insert may be positioned with the centre plane at a negative axial angle in the insert seat. Due to the first relief face forming an obtuse angle with the centre plane, a relief may be provided at the first cutting edge with the centre plane extending at only a slight negative axial angle.
  • Figs. 1a - 1e illustrate different views of a cutting insert 2 for a milling tool according to embodiments.
  • the cutting insert 2 comprises an insert body 4 having a central longitudinal axis 6 extending along a longitudinal direction of the insert body 4.
  • An imaginary centre plane 8 comprising the central longitudinal axis 6 extends centrally through the insert body 4, see Figs. 1c and 1d .
  • the insert body 4 is generally defined by a top surface 10, a bottom surface 12, and a circumferential surface 14 extending between the top surface 10 and the bottom surface 12, circumferentially about the insert body 4.
  • the top and bottom surfaces 10, 12 extend substantially in the longitudinal direction on opposite sides of the centre plane 8.
  • the insert body 4 comprises at the top surface 10 a first rake face 16a, and at the bottom surface 12 a second rake face 16b.
  • the insert body 4 at the circumferential surface 14 comprises a first radial side 18a and a second radial side 18b extending in the longitudinal direction on opposite sides of the insert body 4.
  • the circumferential surface 14 further comprises a first axial side 20a and a second axial side 20b extending across the longitudinal direction and the longitudinal axis 6 on opposite sides of the insert body 4.
  • the first axial side 20a comprises a first relief face 22a, a second relief face 22b, and a first recess 24a.
  • the first relief face 22a extends along the first rake face 16a and the second relief face 22b extends along the second rake face 16b.
  • the first recess 24a extends between the first and second relief faces 22a, 22b, substantially along the centre plane 8.
  • the first recess 24a comprises a first bottom surface 26a.
  • the second axial side 20b comprises a third relief face 22c, a fourth relief face 22d, and a second recess 24b.
  • the third relief face 22c extends along the first rake face 16a and the fourth relief face 22d extends along the second rake face 16b.
  • the second recess 24b extends between the third and fourth relief faces 22c, 22d, substantially along the centre plane 8.
  • the second recess 24b comprises a second bottom surface 26b.
  • the first relief face 22a, the second relief face 22b, and the first recess 24a are arranged such that each point of the first relief face 22a, the second relief face 22b, and the first recess 24a is visible from either a first side view towards the first radial side 18a or from a second side view towards the second radial side18b. Accordingly, the insert body 4 is longer along the longitudinal direction at a central portion towards the central longitudinal axis 6 than at an outer portion towards one of the first or second radial sides 18a, 18b.
  • the first and second side views are seen along the centre plane 8, perpendicularly to the longitudinal axis 6, i.e. as the view illustrated in Fig. 1c and a corresponding view from an opposite side of the insert body 4.
  • Each of the first relief face 22a, the second relief face 22b, and the first bottom surface 26a comprises two major surfaces 28a - 28f.
  • the major surfaces 28a - 28f have been indicated with linear hatching in Fig. 1d .
  • An angle ⁇ between each of the two major surfaces 28a - 28f of the first relief face 22a, the second relief face 22b, and the first bottom surface 24a is obtuse, such that the insert body 4 is longer along the longitudinal direction at a central portion of one of said major surfaces 28a - 28f towards the central longitudinal axis 6 than at an outer portion of the said one of the major surfaces 28a - 28f towards one of the first or second radial sides 18a, 18b, se Fig. 1e .
  • the angle ⁇ between each of the two major surfaces 28a - 28f may be within a range of 160 - 179,5 degrees.
  • the angle ⁇ between the two major surfaces 28a - 28d of the first and second relief faces 22a, 22c may be different than the angle ⁇ between the two major surfaces 28e, 28f of the first bottom surface 26a.
  • the angle ⁇ between the two major surfaces 28a - 28d of the first and second relief faces 22a, 22c may preferably be within a range of 176 - 179 degrees.
  • the angle ⁇ between the two major surfaces 28e, 28f of the first bottom surface 26a may preferably be within a range of 160 - 179 degrees.
  • the third relief face 22c, the fourth relief face 22d, and the second recess 24b are arranged such that each point of the third relief face 22c, the fourth relief face 22d, and the second recess 24b is visible from either the first side view towards or the second side view as discussed above in connection with the first axial side 20a.
  • the insert body 4 is longer along the longitudinal direction at a central portion towards the central longitudinal axis 6 than at an outer portion towards one of the first or second radial sides 18a, 18b.
  • each of the third relief face 22c, the fourth relief face 22d, and the second bottom surface 26b comprises two major surfaces, corresponding to the major surfaces 28a - 28f of first relief face, the second relief face, and the first bottom surface illustrated in Fig. 1d .
  • An angle ⁇ between each of the two major surfaces of the third relief face 22c, the fourth relief face 22d, and the second bottom surface 26b is obtuse, see Fig. 1e .
  • the insert body 4 is longer along the longitudinal direction at a central portion towards the central longitudinal axis 6 than at one of the first or second radial sides 18a, 18b.
  • the angle ⁇ between each of the two major surfaces of the third relief face 22c, the fourth relief face 22d, and the second bottom surface 24b may be the same as the corresponding angle ⁇ between each of the two major surfaces 28a - 28f of the first relief face 22a, the second relief face 22b, and the first bottom surface 24a.
  • the insert body 4 is the longest along the longitudinal direction at a central portion adjacent to the central longitudinal axis 6 and gradually decreases in length towards the first and second radial sides 18a, 18b. Accordingly, a partition line of a multiaxial pressing (MAP) tool for forming the cutting insert 2 is positionable at the central portion, see below with reference to Fig. 2 .
  • MAP multiaxial pressing
  • the cutting insert 2 is formable by MAP with a partition of a relevant pressing tool at the central longitudinal axis 6. All of the major surfaces of first, second, third, and fourth relief faces and the first and second bottom surfaces 26a, 26b may be formed in the MAP operation. Being able to position a partition of a pressing tool at the central longitudinal axis 6 entails that the partition line is positioned in an area where any burrs in the insert body 4 from the MAP operation will not affect the use of the cutting insert 2 to any substantial extent.
  • Fig. 2 illustrates embodiments of a multiaxial pressing (MAP) tool 100 for forming a cutting insert according to the present invention.
  • MAP multiaxial pressing
  • a green ware of the cutting insert is formed, which green ware after sintering forms a cutting insert ready for use in a milling tool.
  • a powder compound is pressed between two vertical stamps into a recess of a die to form a green ware, which after sintering forms a cutting insert.
  • the powder compound in question is pressed not only between the two stamps 102, 104 against the top surface and the bottom surface of the green ware to be manufactured, but also between at two additional stamps 106, 108, which are pressed against the sides and clearance surfaces of the insert body.
  • the two diametrically opposed, horizontally operating stamps 106, 108 can be retracted in a linear path of motion from the finish-pressed green ware in such a way that each point on the stamp surfaces, immediately clears from the green ware without scraping any surface of the same.
  • the design of the cutting insert guarantees a good surface quality, something that in turn allows manufacture of directly pressed, non-ground cutting inserts having good dimensional accuracy.
  • the cutting insert may obtain its final shape directly after pressing and sintering, and without needing to be after-treated by grinding or the like.
  • the cutting insert 2 may be used as pressed and sintered. This will render a cutting insert having a tolerance of approximately +/- 0,03 mm.
  • the cutting insert requires grinding after sintering.
  • a cutting insert according to the present invention also lends itself well for being precision ground to a tolerance within a few thousands of a mm. Since the first bottom surface is formed in the MAP operation, in case of grinding of the first and second relief faces22a, 22b, see Figs. 1b and 1c , of the first axial side 20a, the second bottom surface 26b may serve as a reference support surface during grinding. Accordingly, the first and second relief faces 22a, 22b may be ground without using one of the third or fourth relief faces 22c, 22d as a first reference surface.
  • the internal relationship between the relief faces 2a - 22d may be maintained, while they are positioned on the insert body 4 in relation to the second bottom surface 26b. Accordingly, grinding of the first and second relief surfaces 22a, 22b is independent of the third and fourth relief faces 22c, 22d.
  • the insert body 4 comprises a first cutting edge 30a.
  • the first cutting edge 30a extends along a rim portion at an intersection between the first rake face 16a and both the first radial side 18a and the first axial side 20a.
  • the first cutting edge 30a comprise a first edge portion 32a and a second edge portion 32b extending along the first relief face 22a, a corner edge portion 32c, and a third edge portion 32d extending along the first radial side 18a.
  • the first edge portion 32a adjoins to the second edge portion 32b, the second edge portion 32b adjoins to the corner edge portion 32c, and the corner edge portion 32c adjoins to the third edge portion 32d.
  • the first edge portion 32a extends at an angle ⁇ of at least 150 degrees and at most of 185 degrees to the second edge portion 32b as seen from the second edge portion 32b towards the centre plane 8, see Fig. 1d .
  • the angle ⁇ is 158 degrees. Since the first edge portion 32a extends at an angle ⁇ to the second edge portion 32b and towards the centre plane 8, the second edge portion 32b may be positioned in a relevant milling tool to extend the farthest out in the longitudinal direction. With such an arrangement the milling tool and the cutting insert 2 may be ramped into a workpiece, i.e. the second edge portion 32b may lead a moderate downward cut into the workpiece, without the first edge portion 32a hindering the cut in the downward direction.
  • the first edge portion 32a forms an edge portion of a depression 34 formed in the first rake face 16a.
  • each of the first - fourth relief faces 22a - 22d are convex. More specifically, of the first relief face 22a, the major surface 28a adjacent to the second edge portion 32b is convex, and the corresponding major surfaces of the second - fourth relief faces are convex.
  • the second edge portion 32b is curved.
  • the first edge portion 32a is curved in these embodiments.
  • the angle ⁇ is measured between a tangent of the first edge portion 32a and a tangent of the second edge portion 32b, respectively, at the intersection between the first and second edge portions 32a, 32b.
  • each of the first - fourth relief faces 22a - 22d and the first and second bottom surfaces 26a, 26b may be flat surfaces.
  • the second edge portion 32b is linear, i.e. straight.
  • the insert body 4 comprises a second cutting edge 30b extending along a rim portion at an intersection between the first rake face 16a and both the second radial side 18b and the second axial side 20b, a third cutting edge 30c extending along a rim portion at an intersection between the second rake face 16b and both the first radial side 18a and the second axial side 20b, and a fourth cutting edge 30d extending along a rim portion at an intersection between the second rake face 16b and both the second radial side 18b and the first axial side 20a.
  • the cutting insert 2 is four times indexable in a relevant milling tool.
  • each of the first, second, third, and fourth cutting edges 30a - 30d may be arranged in the milling tool to engage with a workpiece.
  • Each of the second, third, and fourth cutting edges 30b - 30d comprises first, second, third, and corner edge portions in the same manner as the first cutting edge 30a.
  • the first relief face 22a forms an obtuse angle ⁇ with the centre plane 8, see Fig. 1c .
  • the obtuse angle ⁇ may be within a range of 92 - 105 degrees, preferably 94 -100 degrees.
  • the insert body 4 is longer in the longitudinal direction at the first cutting edge 30a than adjacent to the first recess 24a.
  • an acute wedge angle ⁇ e.g. 51 - 84 degrees, preferably 60 - 76 degrees, may easily be provided at the first cutting edge 30a at the first axial side 20a.
  • each of the second, third, and fourth relief faces 22b-22d forms an obtuse angle with the centre plane 8, such that an acute wedge angle may be provided also at each of the second, third, and fourth cutting edges 30b-30d at the respective axial sides 20a, 20b.
  • An imaginary tangential plane 37 at the first cutting edge 30a extends in parallel with the centre plane 8.
  • An angle ⁇ ' between the tangential plane 37 and the first rake face 16a may be within a range of 4 - 24 degrees, preferably within 10 - 20 degrees.
  • An effective rake angel of the cutting insert 2, when it is mounted in a milling tool, is given by the obtuse angle ⁇ , the wedge angle ⁇ , and the axial angle ⁇ of the centre plane 8 in the insert seat 46, see below with reference to Fig. 3a .
  • the major surfaces 28e, 28f of the first bottom surface 26a and the second bottom surface 26b, respectively, each form an angle of 90 degrees with the centre plane 8.
  • the insert body 4 is provided with a through hole 38.
  • a fastening member may extend through the through hole 38 in order to releasably secure the cutting insert 2 to a relevant milling tool.
  • Figs. 3a-3b illustrate embodiments of a milling tool 40.
  • the milling tool 40 is a face milling tool.
  • the milling tool 40 is configured to be rotated about a rotation axis 42 in a rotational direction 43 and comprises a tool body 44.
  • the tool body 44 is provided with an insert seat 46 for receiving a cutting insert 2 according to any aspect and/or embodiment discussed herein.
  • the cutting insert 2 is attached to the tool body 44 by means of a screw 48 extending through the through hole 38 of the cutting insert 2 and being screwed into a threaded hole 50 in the tool body 44 at the insert seat 46, as indicated in the exploded view of Fig. 3b .
  • the milling tool 40 is provided with five insert seats. In each insert seat a cutting insert 2 is arranged. In alternative embodiments the milling tool may be provided with less or more than the illustrated five cutting inserts 2. Suitably a large diameter milling tool is provided with more cutting inserts than a small diameter milling tool.
  • All the cutting inserts 2 are of the same kind. In alternative embodiments of the milling tool the cutting inserts may be of two or more different kinds.
  • the insert seat 46 is provided with a tangential support surface 52, a radial support surface 54, and an axial support surface 56.
  • the cutting insert 2 is arranged with a portion of the second rake face 16b abutting against the tangential support surface 52, a portion of the second radial side 18b abutting against the radial support surface 54, and one of the major surfaces of the second bottom surface 26b of the second recess 24b abutting against the axial support surface 56, see also Fig. 1c .
  • the cutting insert 2 is supported in the insert seat 46 with the first cutting edge 30a extending beyond the insert seat 46 for cutting engagement with a workpiece.
  • the said one of the major surfaces of the cutting insert 2 abutting against the axial support surface 56 is the major surface 28f ' of the second bottom surface 26b closest to the first radial side 18a.
  • the major surface 28f' of the second bottom surface 26b closet to the first radial side 18a corresponds to the major surface 28f of the first bottom surface 24a at the second radial side 18b illustrated in Fig. 1d .
  • the tangential support surface 52 extends from a first end portion 58 at an axial end of the tool body 44 to a second end portion 60 at the axial support surface 56 of the insert seat 46. Seen in the rotational direction 43 of the milling tool 40 the second end portion 60 extends ahead of the first end portion 58.
  • the cutting insert 2 is positioned with the centre plane 8 at a negative axial angle ⁇ in the insert seat 46. Due to the acute wedge angle ⁇ achieved as discussed above and as illustrated in Fig. 1c , the first rake face 16a adjacent to the cutting edge 32d is arranged at a positive axial rake angle.

Claims (15)

  1. Plaquette de coupe (2) destinée à un outil de fraisage, la plaquette de coupe (2) comprenant un corps de plaquette (4) présentant un axe longitudinal central (6) s'étendant le long d'une direction longitudinale du corps de plaquette (4) et un plan central imaginaire (8) comprenant l'axe longitudinal central (6), le corps de plaquette (4) étant généralement défini par une surface supérieure (10), une surface inférieure (12), et une surface circonférentielle (14) s'étendant entre la surface supérieure (10) et la surface inférieure (12), les surfaces supérieure et inférieure (10, 12) s'étendant sensiblement dans la direction longitudinale sur des côtés opposés du plan central (8),
    où le corps de plaquette (4) au niveau de la surface supérieure (10) comprend une première face d'attaque (16a) et la surface inférieure (12) comprend une deuxième face d'attaque (16b)
    où le corps de plaquette (4) au niveau de la surface circonférentielle (14) comprend un premier côté radial (18a) et un deuxième côté radial (18b) s'étendant dans la direction longitudinale sur des côtés opposés du corps de plaquette (4), et un premier côté axial (20a) et un deuxième côté axial (20b) s'étendant transversalement à la direction longitudinale sur des côtés opposés du corps de plaquette (4),
    où le premier côté axial (20a) comprend une première face de dépouille (22a), une deuxième face de dépouille (22b), et un premier évidement (24a), la première face de dépouille (22a) s'étendant le long de la première face d'attaque (16a) et la deuxième face de dépouille (22b) s'étendant le long de la deuxième face d'attaque (16b),
    où le premier évidement (24a) s'étend entre les première et deuxième faces de dépouille (22a, 22b) et comprend une première surface inférieure (26a), et
    où le corps de plaquette (4) comprend en outre au moins une première arête de coupe (30a), la première arête de coupe (30a) s'étendant le long d'une partie de bordure à l'intersection de la première face d'attaque (16a) et à la fois du premier côté radial (18a) et du premier côté axial (20a),
    caractérisée en ce que
    la première face de dépouille (22a), la deuxième face de dépouille (22b), et le premier évidement (24a) sont agencés de telle sorte que chaque point de la première face de dépouille (22a), de la deuxième face de dépouille (22b), et du premier évidement (24a) est visible soit selon une première vue de côté en direction du premier côté radial (18a), soit selon une deuxième vue de côté en direction du deuxième côté radial (18b), et de telle sorte que le corps de plaquette (4) est plus long le long de la direction longitudinale au niveau d'une partie centrale vers l'axe longitudinal central (6) qu'au niveau d'une partie extérieure vers l'un des premier ou deuxième côtés radiaux (18a, 18b).
  2. Plaquette de coupe (2) selon la revendication 1, dans laquelle chaque surface parmi la première face de dépouille (22a), la deuxième face de dépouille (22b), et la première surface inférieure (26a) comprend deux surfaces principales (28a-28f).
  3. Plaquette de coupe (2) selon la revendication 2, dans laquelle un angle (η) entre chacune des deux surfaces principales (28a-28f) de la première face de dépouille (22a), de la deuxième face de dépouille (22b), et de la première surface inférieure (26a) est obtus, de telle sorte que le corps de plaquette (4) est plus long le long de la direction longitudinale au niveau d'une partie centrale de l'une desdites surfaces principales (28a-28f) vers l'axe longitudinal central (6) qu'au niveau d'une partie extérieure de ladite une desdites surfaces principales (28a-28f) vers l'un des premier ou deuxième côtés radiaux (18a, 18b).
  4. Plaquette de coupe (2) selon la revendication 2 ou 3, dans laquelle les deux surfaces principales (28e, 28f) de la première surface inférieure (26a) sont des surfaces planes.
  5. Plaquette de coupe (2) selon l'une quelconque des revendications 2 à 4, dans laquelle au moins l'une des surfaces principales (28a-28d) de chacune des première et deuxième faces de dépouille (22a, 22b) est convexe.
  6. Plaquette de coupe (2) selon l'une quelconque des revendications précédentes, dans laquelle la première face de dépouille (22a) forme un angle obtus (ε) avec le plan central (8), de telle sorte que le corps de plaquette (4) est plus long dans la direction longitudinale au niveau de la première arête de coupe (30a) qu'à proximité du premier évidement (24a).
  7. Plaquette de coupe (2) selon l'une quelconque des revendications précédentes, dans laquelle la première arête de coupe (30a) comprend une première partie d'arête (32a) et une deuxième partie d'arête (32b) s'étendant le long de la première face de dépouille (22a), une troisième partie d'arête (32d) s'étendant le long du premier côté radial (18a), et une partie d'arête de coin (32c), où la première partie d'arête (32a) est attenante à la deuxième partie d'arête (32b), la deuxième partie d'arête (32b) est attenante à la partie d'arête de coin (32c), et la partie d'arête de coin (32c) est attenante à la troisième partie d'arête (32d), et où la première partie d'arête (32a) s'étend selon un angle (φ) par rapport à la deuxième partie d'arête (32b) à partir de la deuxième partie d'arête (32b) en direction du plan central (8).
  8. Plaquette de coupe (2) selon la revendication 7, dans laquelle la première partie d'arête (32a) forme une partie d'arête d'une cavité (34) ménagée dans la première face d'attaque (16a).
  9. Plaquette de coupe (2) selon l'une quelconque des revendications précédentes, dans laquelle le deuxième côté axial (20b) comprend une troisième face de dépouille (22c), une quatrième face de dépouille (22d), et un deuxième évidement (24b), la troisième face de dépouille (22c) s'étendant le long de la première face d'attaque (16a) et la quatrième face de dépouille (22d) s'étendant le long de la deuxième face d'attaque (16b), où le deuxième évidement (24b) s'étend entre les troisième et quatrième faces de dépouille (22c, 22d) et comprend une deuxième surface inférieure (26b), où la troisième face de dépouille (22c), la quatrième face de dépouille (22d), et le deuxième évidement (24b) sont agencés de telle sorte que chaque point de la troisième face de dépouille (22c), de la quatrième face de dépouille (22d), et du deuxième évidement (24b) est visible soit selon la première vue de côté en direction du premier côté radial (18a), soit selon la deuxième vue de côté en direction du deuxième côté radial (18b), et de telle sorte que le corps de plaquette est plus long le long de la direction longitudinale au niveau d'une partie centrale vers l'axe longitudinal central (6) qu'au niveau d'une partie extérieure vers l'un des premier ou deuxième côtés radiaux (18a, 18b).
  10. Plaquette de coupe (2) selon la revendication 9, dans laquelle le corps de plaquette (4) est le plus long le long de la direction longitudinale au niveau d'une partie centrale adjacente à l'axe longitudinal central (6) et est de moins en moins long en allant vers les premier et deuxième côtés radiaux (18a, 18b), de telle sorte qu'un plan de joint d'un outil de presse multiaxial destiné à former la plaquette de coupe (2) est positionnable au niveau de la partie centrale.
  11. Plaquette de coupe (2) selon la revendication 9 ou 10, dans laquelle le corps de plaquette (4) comprend
    une deuxième arête de coupe (30b) s'étendant le long d'une partie de bordure à l'intersection de la première face d'attaque (16a) et à la fois du deuxième côté radial (18b) et du deuxième côté axial (20b),
    une troisième arête de coupe (30c) s'étendant le long d'une partie de bordure à l'intersection de la deuxième face d'attaque (16b) et à la fois du premier côté radial (18a) et du deuxième côté axial (20b),
    et une quatrième arête de coupe (30d) s'étendant le long d'une partie de bordure à l'intersection de la deuxième face d'attaque (16b) et à la fois du deuxième côté radial (18b) et du premier côté axial (20a),
    de telle sorte que la plaquette de coupe (2) offre quatre positions interchangeables dans un outil de fraisage.
  12. Outil de fraisage (40) configuré pour être entraîné en rotation autour d'un axe de rotation (42) comprenant un corps d'outil (44), où le corps d'outil (44) au niveau d'une partie d'extrémité axiale de celui-ci est doté d'un siège pour plaquette (46) destiné à recevoir une plaquette de coupe (2),
    caractérisé en ce que l'outil de fraisage (40) comprend une plaquette de coupe (2) selon l'une quelconque des revendications précédentes agencée dans le siège pour plaquette (46).
  13. Outil de fraisage (40) selon la revendication 12, dans lequel le siège pour plaquette (46) est doté d'une surface de support tangentielle (52), d'une surface de support radiale (54), et d'une surface de support axiale (56), et
    où la plaquette de coupe (2) est agencée de sorte à ce qu'une partie de la deuxième face d'attaque (16b) vienne buter contre la surface de support tangentielle (52), qu'une partie du deuxième côté radial (18b) vienne buter contre la surface de support radiale (54), et qu'une partie de la deuxième surface inférieure (26b) du deuxième évidement (24b) vienne buter contre la surface de support axiale (56).
  14. Outil de fraisage (40) selon la revendication 13, où la deuxième surface inférieure (26b) comprend deux parties de surface principales, et où la partie de la deuxième surface inférieure (26b) venant buter contre la surface de support axiale (56) constitue la surface principale (28f) de la deuxième surface inférieure (26b) qui est la plus proche du premier côté radial (18a).
  15. Outil de fraisage (40) selon la revendication 13 ou 14, dans lequel la surface de support tangentielle (52) s'étend depuis une première partie d'extrémité (58) au niveau d'une extrémité axiale du corps d'outil (44) jusqu'à une deuxième partie d'extrémité (60) au niveau de la surface de support axiale (56) du siège pour plaquette (46), et où lorsque l'outil est observé selon un sens de rotation (43) de l'outil de fraisage (40), la deuxième partie d'extrémité (60) s'étend devant la première partie d'extrémité (58).
EP15160853.6A 2015-03-25 2015-03-25 Insert de coupe et outil de fraisage Active EP3072616B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP15160853.6A EP3072616B1 (fr) 2015-03-25 2015-03-25 Insert de coupe et outil de fraisage
JP2017549660A JP6675416B2 (ja) 2015-03-25 2016-03-03 切削インサート及びフライス工具
CN201680017289.5A CN107405699B (zh) 2015-03-25 2016-03-03 切削刀片及铣刀
US15/561,044 US10350686B2 (en) 2015-03-25 2016-03-03 Cutting insert and milling tool
PCT/EP2016/054550 WO2016150672A1 (fr) 2015-03-25 2016-03-03 Insert de découpe et outil de perçage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15160853.6A EP3072616B1 (fr) 2015-03-25 2015-03-25 Insert de coupe et outil de fraisage

Publications (2)

Publication Number Publication Date
EP3072616A1 EP3072616A1 (fr) 2016-09-28
EP3072616B1 true EP3072616B1 (fr) 2018-10-10

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EP (1) EP3072616B1 (fr)
JP (1) JP6675416B2 (fr)
CN (1) CN107405699B (fr)
WO (1) WO2016150672A1 (fr)

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US10350686B2 (en) 2019-07-16
CN107405699A (zh) 2017-11-28
JP2018509306A (ja) 2018-04-05
WO2016150672A1 (fr) 2016-09-29
EP3072616A1 (fr) 2016-09-28
US20180221969A1 (en) 2018-08-09
JP6675416B2 (ja) 2020-04-01
CN107405699B (zh) 2020-04-21

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